Fair Values of Financial Instruments	6 Months Ended
Fair Values of Financial Instruments	Jun. 30, 2011
Notes to Financial Statements [Abstract]
Fair Values of Financial Instruments	Note L - Fair Values of Financial Instruments FASB Accounting Standards Codification ("ASC") 820, "Fair Value Measurements and Disclosures" ("ASC 820"), defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 also provides guidance for using fair value to measure financial assets and liabilities. The Codification requires disclosure of the level within the fair value hierarchy in which the fair value measurements fall, including measurements using quoted prices in active markets for identical assets or liabilities (Level 1), quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active (Level 2), and significant valuation assumptions that are not readily observable in the market (Level 3). Cash and cash equivalents The carrying amounts for cash and cash equivalents approximated fair value at June 30, 2011 and December 31, 2010. Mortgage loan receivable The Company owns the B participation piece (the "B piece") of a first mortgage secured by an 844,000 square foot office building in Dallas, Texas known as 2100 Ross, and the carrying amount of the mortgage loan was approximately $9.2 million and $8.8 million at June 30, 2011 and December 31, 2010, respectively. In connection with the sale of One Park Ten, the Company seller-financed a $1.5 million note receivable, and the carrying amount of the note was $1.5 million at June 30, 2011 and December 31, 2010. The carrying amount of each mortgage loan approximated fair value at June 30, 2011 and December 31, 2010. Mortgage notes payable The fair value of the mortgage notes payable is estimated using discounted cash flow analysis, based on the Company's current incremental borrowing rates for similar types of borrowing arrangements. The aggregate fair value of the mortgage notes payable at June 30, 2011 was $876.3 million as compared to its carrying amount of $959.5 million. The aggregate fair value of the mortgage notes payable at December 31, 2010 was $734.6 million as compared to its carrying amount of $773.5 million. Notes payable to banks The fair value of the Company's notes payable to banks is estimated by discounting expected cash flows at current market rates. The aggregate fair value of the notes payable to banks at June 30, 2011 was $149.7 million as compared to its carrying amount of $166.2 million. The aggregate fair value of the notes payable to banks at December 31, 2010 was $109.6 million as compared to its carrying amount of $110.8 million. Interest rate swap agreements The fair value of the interest rate swaps is determined by estimating the expected cash flows over the life of the swap using the mid-market rate and price environment as of the last trading day of the reporting period. This information is considered a Level 2 input as defined by ASC 820. The aggregate fair value liability of the interest rate swaps at June 30, 2011 and December 31, 2011 was $5.4 million and $3.0 million, respectively.

This item represents the complete disclosure regarding the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the Company is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risk is are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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